/*
 * Copyright 2018 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "modules/skottie/src/SkottieJson.h"

#include "include/core/SkData.h"
#include "include/core/SkPath.h"
#include "include/core/SkPoint.h"
#include "include/core/SkScalar.h"
#include "include/core/SkStream.h"
#include "include/core/SkString.h"
#include "modules/skottie/src/SkottieValue.h"
#include <limits>
#include <vector>

namespace skottie {
using namespace skjson;

template <> bool Parse<SkScalar>(const Value &v, SkScalar *s)
{
    // Some versions wrap values as single-element arrays.
    if (const skjson::ArrayValue *array = v) {
        if (array->size() > 0) {
            return Parse((*array)[0], s);
        }
    }

    if (const skjson::NumberValue *num = v) {
        *s = static_cast<SkScalar>(**num);
        return true;
    }

    return false;
}

template <> bool Parse<bool>(const Value &v, bool *b)
{
    switch (v.getType()) {
        case Value::Type::kNumber:
            *b = SkToBool(*v.as<NumberValue>());
            return true;
        case Value::Type::kBool:
            *b = *v.as<BoolValue>();
            return true;
        default:
            break;
    }

    return false;
}

template <typename T> bool ParseIntegral(const Value &v, T *result)
{
    if (const skjson::NumberValue *num = v) {
        const auto dbl = **num;
        if (dbl > static_cast<double>(std::numeric_limits<T>::max()) ||
            dbl < static_cast<double>(std::numeric_limits<T>::min())) {
            return false;
        }

        *result = static_cast<T>(dbl);
        return true;
    }

    return false;
}

template <> bool Parse<int>(const Value &v, int *i)
{
    return ParseIntegral(v, i);
}

template <> bool Parse<size_t>(const Value &v, size_t *sz)
{
    return ParseIntegral(v, sz);
}

template <> bool Parse<SkString>(const Value &v, SkString *s)
{
    if (const skjson::StringValue *sv = v) {
        s->set(sv->begin(), sv->size());
        return true;
    }

    return false;
}

template <> bool Parse<SkV2>(const Value &v, SkV2 *v2)
{
    if (!v.is<ArrayValue>())
        return false;
    const auto &av = v.as<ArrayValue>();

    // We need at least two scalars (BM sometimes exports a third value == 0).
    return av.size() >= 2 && Parse<SkScalar>(av[0], &v2->x) && Parse<SkScalar>(av[1], &v2->y);
}

template <> bool Parse<SkPoint>(const Value &v, SkPoint *pt)
{
    if (!v.is<ObjectValue>())
        return false;
    const auto &ov = v.as<ObjectValue>();

    return Parse<SkScalar>(ov["x"], &pt->fX) && Parse<SkScalar>(ov["y"], &pt->fY);
}

template <> bool Parse<VectorValue>(const Value &v, VectorValue *vec)
{
    if (!v.is<ArrayValue>())
        return false;
    const auto &av = v.as<ArrayValue>();

    vec->resize(av.size());
    for (size_t i = 0; i < av.size(); ++i) {
        if (!Parse(av[i], vec->data() + i)) {
            return false;
        }
    }

    return true;
}

const skjson::StringValue *ParseSlotID(const skjson::ObjectValue *jobj)
{
    if (jobj) {
        if (const skjson::StringValue *sid = (*jobj)["sid"]) {
            return sid;
        }
    }
    return nullptr;
}
} // namespace skottie
